Solution
Discount is 10% so that means you only need
to pay (100 - 10)% = 90% of the total cost of
the binder. Cost with discount = $6 × 90% = $6 × 0.9 = $5.40. Sales tax is 8.25% so you will pay 8.25% × $5.40 = $0.45 for sales tax. Total cost with sales tax = $5.40 + $0.45 = $5.85.
Alternate Solution: (1 - discount) × (1 + sales tax) ×
original cost = total cost. 0.9 × 1.0825 × $6 =
$5.85.
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